串口调试的发送指令例程

以下是一个简单的串口调试发送指令的例程，使用C++语言编写：

#include <iostream>
#include <Windows.h>

using namespace std;

int main()
{
    HANDLE hSerial;
    DCB dcbSerialParams = {0};
    COMMTIMEOUTS timeouts = {0};
    DWORD dwBytesWritten;
    char szBuff[] = "AT\r\n";

    // 打开串口
    hSerial = CreateFile("COM1", GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hSerial == INVALID_HANDLE_VALUE) {
        cout << "Error opening serial port!" << endl;
        return 1;
    }

    // 配置串口参数
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        cout << "Error getting serial port state!" << endl;
        CloseHandle(hSerial);
        return 1;
    }
    dcbSerialParams.BaudRate = CBR_9600;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if (!SetCommState(hSerial, &dcbSerialParams)) {
        cout << "Error setting serial port state!" << endl;
        CloseHandle(hSerial);
        return 1;
    }

    // 配置串口超时时间
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    if (!SetCommTimeouts(hSerial, &timeouts)) {
        cout << "Error setting serial port timeouts!" << endl;
        CloseHandle(hSerial);
        return 1;
    }

    // 发送指令
    if (!WriteFile(hSerial, szBuff, sizeof(szBuff), &dwBytesWritten, NULL)) {
        cout << "Error writing to serial port!" << endl;
        CloseHandle(hSerial);
        return 1;
    }

    // 关闭串口
    CloseHandle(hSerial);

    return 0;
}

这个例程首先打开COM1串口，然后配置了串口参数和超时时间。最后发送了一个指令"AT\r\n"，并关闭了串口。需要注意的是，实际使用时需要根据自己的串口参数和指令内容进行修改。